In the slot A Athlon days, I was young and didn’t have much money so I built a 900 Slot A Thunderbird rig in a Compaq display case from Radio Shack they sold for $5 as opposed to throwing it away. Had an MSI motherboard, original GeForce (I used to buy them with bad fans at a computer show and fix them) and the cheapest $9 300W PSU you could buy that was in this flimsy galvanized steel case that you could almost bend by hand. Was playing a game one hot July day and even though I had the AC on... Kaboom, thick gray smoke everywhere. Granted the PSU lasted quite a while. Everything survived though.